US5573808A - Method for producing a multilayer circuit - Google Patents

Method for producing a multilayer circuit Download PDF

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Publication number
US5573808A
US5573808A US08/589,234 US58923496A US5573808A US 5573808 A US5573808 A US 5573808A US 58923496 A US58923496 A US 58923496A US 5573808 A US5573808 A US 5573808A
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United States
Prior art keywords
electrodes
capacitor
producing
green ceramic
ceramic sheet
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Expired - Fee Related
Application number
US08/589,234
Inventor
Werner Gruenwald
Walter Roethlingshoefer
Ulrich Goebel
Ralf Haug
Manfred Moser
Annette Seibold
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Robert Bosch GmbH
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Robert Bosch GmbH
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Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOSER, MANFRED, GOEBEL, ULRICH, ROETHLINGSHOEFER, WALTER, GRUENWALD, WERNER, HAUG, RALF, LAETSCH, ANNETTE
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
    • H05K1/162—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/30—Stacked capacitors
    • H10W70/05—
    • H10W70/611—
    • H10W70/685—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H05K1/092—Dispersed materials, e.g. conductive pastes or inks
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09236—Parallel layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09763—Printed component having superposed conductors, but integrated in one circuit layer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/20—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern
    • H05K3/207—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern using a prefabricated paste pattern, ink pattern or powder pattern
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
    • H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/43—Electric condenser making
    • Y10T29/435—Solid dielectric type

Definitions

  • EP 300 186 describes a method for producing a multilayer circuit in which a stack of green ceramic sheets is fired. A metal pattern is applied to individual ceramic sheets and then pressed into the green ceramic sheet, The green ceramic sheet is heated in the process in order to soften it.
  • German Patent Application No. DE 40 33 707 describes a method for producing a resistance element in which a resistive layer and conductor track layers are produced on a carrier using thick-film technology. The structure formed in this way is then pressed into a green flexible ceramic sheet and separated from the carrier.
  • the method according to the present invention has the advantage that it is possible to produce high-quality multilayer circuits having incorporated capacitances. At the same time, the mechanical quality of the multilayer circuits is not impaired by the structures for the capacitances. Moreover, the method according to the present invention is simple and can be carried out using, at least in part, well known process steps.
  • Structures may be produced in a particularly simple manner by screen printing. In this case, it is also possible to use materials which cannot be fired together with the material or the green ceramic sheets. Materials which have already been fired can also be used as a dielectric, which materials permit the production of capacitors having a particularly high quality.
  • FIG. 1 illustrates a first part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 2 illustrates a second part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 3 illustrates a third part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 4 illustrates a fourth part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 5 illustrates a first part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 6 illustrates a second part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIG. 7 illustrates a third part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
  • FIGS. 1 to 4 show a first exemplary embodiment of the method according to the present invention for producing a multilayer circuit.
  • FIG. 1 shows a carrier 10, on which a first electrode 1 and a second electrode 2 are arranged.
  • a dielectric 3 is provided between the first electrode 1 and the second electrode 2.
  • This structure is produced in a particularly simple manner by firstly printing a structure for the first electrode 1 directly onto the carrier 10 by means of screen printing. A metal-containing paste is used for this, for example.
  • a layer for the dielectric 3 is then printed onto this, use being made for this of a paste which, after a firing step, forms a dielectric layer having a particularly high dielectric constant.
  • An electrically conductive paste for the second electrode 2 is then printed onto this, again by means of screen printing.
  • the carrier 10 either includes a material to which the printed-on pastes do not adhere very well or, as described in German Patent Application No. DE 40 33 707, is provided with a separating layer.
  • FIG. 2 shows how the carrier 10 prepared in this way with the electrodes 1, 2 and the dielectric layer 3 arranged on it is pressed into a green ceramic sheet 11.
  • the ceramic sheet which may also be heated during the pressing-in operation so that it is sufficiently soft, is arranged on a retaining mount 12 during this operation.
  • the electrodes 1, 2 and the dielectric layer 3 are then pressed into the soft green ceramic sheet 11.
  • FIG. 3 shows the structures which have been pressed in this way into the green ceramic sheet 11, after the carrier 10 and the retaining mount 12 have been removed.
  • the green ceramic sheet 11 is then arranged with further green ceramic sheets 13 in a stack and fired to form a multilayer circuit 20.
  • This multilayer circuit 20 is shown in FIG. 4.
  • Plated-through holes 21 and conductor tracks 22 can then be provided in and on the further sheets 13, by means of which plated-through holes and conductor tracks contact is made with the first electrode 1 and the second electrode 2, which can now be arranged inside the multilayer circuit 20.
  • the multilayer circuit shown in FIG. 4 thus has a capacitor structure inside it, which is formed by the first electrode 1, the second electrode 2 and the dielectric 3 arranged in between. Since the capacitor structure is situated inside the multilayer circuit 20, it has particularly good protection from environmental influences. This is of particular significance if the dielectric 3 is produced by a printed-on paste, since voids frequently remain in such pastes after firing, into which voids gases or atmospheric humidity contained in the ambient air can then penetrate and thus influence the dielectric constant of the material. Furthermore, the dielectric 3 can be applied in particularly thin layers, with the result that large capacitances of the capacitor structure are possible.
  • FIGS. 1, 2 shown in FIGS. 1 to 4 are constructed as planar electrodes and require a relatively large surface of the green ceramic sheet 11.
  • FIGS. 5, 6 and 7 show a further production method according to the present invention, in which finger structures are used.
  • FIG. 5 shows a plan view of a carrier 10 onto which there are printed intermeshing finger-like structures for the first electrode 1 underneath the second electrode. These structures can be applied using a single printing step.
  • FIG. 6 shows a second printing step, in which a paste for the dielectric layer is applied.
  • the structure produced in this way on the carrier 10 is then pressed into a green ceramic sheet, as described above with regard to FIGS. 1 to 3, and the carrier is removed from the electrodes 1, 2 and the dielectric.
  • FIG. 7 shows a cross section of the green ceramic sheet 11 formed in this way with pressed-in electrodes 1, 2 and the dielectric 3. As is evident, the conducting structures for the electrodes 1, 2 are completely embedded in the dielectric 3. If this green ceramic sheet is arranged together with further green ceramic sheets 13 in a stack, there is produced, in a manner analogous to FIG. 4, a multilayer circuit inside which a capacitor of high capacitance is arranged.
  • the production method according to FIGS. 5 to 7 is simpler than the method according to FIGS. 1 to 4, since the comb-like intermeshing electrodes can be produced using a single printing step.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)

Abstract

In a method for producing a multilayer circuit, it is possible to produce capacitor structures including electrodes and a dielectric arranged in between. By pressing the capacitor structures into a ceramic layer, it is possible to produce a high-quality capacitor inside the multilayer circuit.

Description

BACKGROUND INFORMATION
European Patent Application No. EP 300 186 describes a method for producing a multilayer circuit in which a stack of green ceramic sheets is fired. A metal pattern is applied to individual ceramic sheets and then pressed into the green ceramic sheet, The green ceramic sheet is heated in the process in order to soften it.
German Patent Application No. DE 40 33 707 describes a method for producing a resistance element in which a resistive layer and conductor track layers are produced on a carrier using thick-film technology. The structure formed in this way is then pressed into a green flexible ceramic sheet and separated from the carrier.
SUMMARY OF THE INVENTION
The method according to the present invention has the advantage that it is possible to produce high-quality multilayer circuits having incorporated capacitances. At the same time, the mechanical quality of the multilayer circuits is not impaired by the structures for the capacitances. Moreover, the method according to the present invention is simple and can be carried out using, at least in part, well known process steps.
Structures may be produced in a particularly simple manner by screen printing. In this case, it is also possible to use materials which cannot be fired together with the material or the green ceramic sheets. Materials which have already been fired can also be used as a dielectric, which materials permit the production of capacitors having a particularly high quality.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a first part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 2 illustrates a second part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 3 illustrates a third part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 4 illustrates a fourth part of a first exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 5 illustrates a first part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 6 illustrates a second part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
FIG. 7 illustrates a third part of a second exemplary embodiment of the method according to the present invention for producing a capacitor.
DETAILED DESCRIPTION
FIGS. 1 to 4 show a first exemplary embodiment of the method according to the present invention for producing a multilayer circuit. FIG. 1 shows a carrier 10, on which a first electrode 1 and a second electrode 2 are arranged. A dielectric 3 is provided between the first electrode 1 and the second electrode 2. This structure is produced in a particularly simple manner by firstly printing a structure for the first electrode 1 directly onto the carrier 10 by means of screen printing. A metal-containing paste is used for this, for example. A layer for the dielectric 3 is then printed onto this, use being made for this of a paste which, after a firing step, forms a dielectric layer having a particularly high dielectric constant. As an alternative, it is also possible to apply a ceramic lamina which has already been fired and has a high dielectric constant. An electrically conductive paste for the second electrode 2 is then printed onto this, again by means of screen printing.
The carrier 10 either includes a material to which the printed-on pastes do not adhere very well or, as described in German Patent Application No. DE 40 33 707, is provided with a separating layer.
FIG. 2 shows how the carrier 10 prepared in this way with the electrodes 1, 2 and the dielectric layer 3 arranged on it is pressed into a green ceramic sheet 11. The ceramic sheet, which may also be heated during the pressing-in operation so that it is sufficiently soft, is arranged on a retaining mount 12 during this operation. By compressing the carrier 10 against the retaining mount 12, the electrodes 1, 2 and the dielectric layer 3 are then pressed into the soft green ceramic sheet 11.
FIG. 3 shows the structures which have been pressed in this way into the green ceramic sheet 11, after the carrier 10 and the retaining mount 12 have been removed.
In a known manner, the green ceramic sheet 11 is then arranged with further green ceramic sheets 13 in a stack and fired to form a multilayer circuit 20. This multilayer circuit 20 is shown in FIG. 4. Plated-through holes 21 and conductor tracks 22 can then be provided in and on the further sheets 13, by means of which plated-through holes and conductor tracks contact is made with the first electrode 1 and the second electrode 2, which can now be arranged inside the multilayer circuit 20.
The multilayer circuit shown in FIG. 4 thus has a capacitor structure inside it, which is formed by the first electrode 1, the second electrode 2 and the dielectric 3 arranged in between. Since the capacitor structure is situated inside the multilayer circuit 20, it has particularly good protection from environmental influences. This is of particular significance if the dielectric 3 is produced by a printed-on paste, since voids frequently remain in such pastes after firing, into which voids gases or atmospheric humidity contained in the ambient air can then penetrate and thus influence the dielectric constant of the material. Furthermore, the dielectric 3 can be applied in particularly thin layers, with the result that large capacitances of the capacitor structure are possible.
The electrodes 1, 2 shown in FIGS. 1 to 4 are constructed as planar electrodes and require a relatively large surface of the green ceramic sheet 11. FIGS. 5, 6 and 7 show a further production method according to the present invention, in which finger structures are used.
FIG. 5 shows a plan view of a carrier 10 onto which there are printed intermeshing finger-like structures for the first electrode 1 underneath the second electrode. These structures can be applied using a single printing step. FIG. 6 then shows a second printing step, in which a paste for the dielectric layer is applied. The structure produced in this way on the carrier 10 is then pressed into a green ceramic sheet, as described above with regard to FIGS. 1 to 3, and the carrier is removed from the electrodes 1, 2 and the dielectric. FIG. 7 shows a cross section of the green ceramic sheet 11 formed in this way with pressed-in electrodes 1, 2 and the dielectric 3. As is evident, the conducting structures for the electrodes 1, 2 are completely embedded in the dielectric 3. If this green ceramic sheet is arranged together with further green ceramic sheets 13 in a stack, there is produced, in a manner analogous to FIG. 4, a multilayer circuit inside which a capacitor of high capacitance is arranged.
The production method according to FIGS. 5 to 7 is simpler than the method according to FIGS. 1 to 4, since the comb-like intermeshing electrodes can be produced using a single printing step.

Claims (4)

What is claimed is:
1. A method for producing a multilayer circuit, comprising the steps of:
providing a dielectric arranged between first and second electrodes on a carrier, thereby forming a capacitor;
pressing the capacitor into a first green ceramic sheet;
separating the carrier from the structures after the capacitor is pressed into the first green ceramic sheet; and
firing the first green ceramic sheet with a second green ceramic sheet in a stack formation.
2. The method according to claim 1, wherein:
the structures include first and second electrodes; and
the first and second electrodes are applied to the carrier by screen printing of a paste.
3. The method according to claim 1, wherein the first and second electrodes are constructed as planar electrodes.
4. The method according to claim 1, wherein the first and second electrodes are constructed as intermeshing finger structures.
US08/589,234 1995-03-16 1996-01-22 Method for producing a multilayer circuit Expired - Fee Related US5573808A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509554A DE19509554A1 (en) 1995-03-16 1995-03-16 Multilayer circuit manufacturing method for ceramic capacitor
DE19509554.5 1995-03-16

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5876538A (en) * 1996-03-09 1999-03-02 Robert Bosch Gmbh Method for manufacturing a ceramic multilayer substrate for complex electronic circuits
US5950292A (en) * 1997-03-04 1999-09-14 Sandia Corporation Methods of fabricating applique circuits
US20020026978A1 (en) * 2000-09-07 2002-03-07 Murata Manufacturing Co., Ltd. Multilayer ceramic substrate and manufacturing method therefor
US6533888B2 (en) * 1998-02-26 2003-03-18 International Business Machines Corporation Apparatus and method for fabricating buried and flat metal features
US6542351B1 (en) * 2001-06-28 2003-04-01 National Semiconductor Corp. Capacitor structure
US20060162844A1 (en) * 2005-01-26 2006-07-27 Needes Christopher R Multi-component LTCC substrate with a core of high dielectric constant ceramic material and processes for the development thereof
EP1517596A3 (en) * 2003-09-18 2006-11-02 E.I. du Pont de Nemours and Company High tollerance embedded capacitors
US20090056978A1 (en) * 2007-09-05 2009-03-05 Hisao Miura Multilayer ceramic circuit board having protruding portion and method for manufacturing the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2315510A3 (en) * 2001-06-05 2012-05-02 Dai Nippon Printing Co., Ltd. Wiring board provided with passive element
DE10332579A1 (en) * 2003-07-17 2004-11-25 Siemens Ag Electronic circuit board is manufactured with both external and internal conductor tracks
JP2013062266A (en) * 2010-01-15 2013-04-04 Sanyo Electric Co Ltd Method for manufacturing capacitor built-in circuit board
CN114394415B (en) * 2021-12-28 2023-12-12 赤壁市万皇智能设备有限公司 FPC automated production line based on AGV automatic handling system

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US2390025A (en) * 1943-10-04 1945-11-27 Du Pont Process for the manufacture of electrical capacitors
US3334002A (en) * 1964-11-12 1967-08-01 Siemens Ag Method of manufacturing capacitor strips
US3470018A (en) * 1964-08-24 1969-09-30 Melpar Inc Thin film capacitor
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US3334002A (en) * 1964-11-12 1967-08-01 Siemens Ag Method of manufacturing capacitor strips
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DE4033707A1 (en) * 1990-10-24 1992-04-30 Bosch Gmbh Robert Cermet thick-film resistor - has flush conductive track pressed together with resistive track(s) into ceramic green sheet over polished surface
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5876538A (en) * 1996-03-09 1999-03-02 Robert Bosch Gmbh Method for manufacturing a ceramic multilayer substrate for complex electronic circuits
US5950292A (en) * 1997-03-04 1999-09-14 Sandia Corporation Methods of fabricating applique circuits
US6533888B2 (en) * 1998-02-26 2003-03-18 International Business Machines Corporation Apparatus and method for fabricating buried and flat metal features
US20020026978A1 (en) * 2000-09-07 2002-03-07 Murata Manufacturing Co., Ltd. Multilayer ceramic substrate and manufacturing method therefor
US6542351B1 (en) * 2001-06-28 2003-04-01 National Semiconductor Corp. Capacitor structure
EP1517596A3 (en) * 2003-09-18 2006-11-02 E.I. du Pont de Nemours and Company High tollerance embedded capacitors
US20060162844A1 (en) * 2005-01-26 2006-07-27 Needes Christopher R Multi-component LTCC substrate with a core of high dielectric constant ceramic material and processes for the development thereof
US20090056978A1 (en) * 2007-09-05 2009-03-05 Hisao Miura Multilayer ceramic circuit board having protruding portion and method for manufacturing the same
US8003893B2 (en) * 2007-09-05 2011-08-23 Alps Electric Co., Ltd. Multilayer ceramic circuit board having protruding portion and method for manufacturing the same

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JPH08264948A (en) 1996-10-11
DE19509554A1 (en) 1996-09-19

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